Small, strong, and quiet The EHEIM compactON is a small and effective aquarium pump. Nine sizes are available, with flow rates ranging from 170 to 16,000 liters per hour. The compact design of the EHEIM compactON aquarium pump is what gives it its name, and the included accessory bag makes it suitable for a variety of applications. The EHEIM compactON 2100-5000 can also be adapted for use outside of water. They can also be used in marine water without any issues because of the high-quality material. With the exception of the EHEIM compactON 5000/9000/12000/16000, all models have an adjustable flow rate for even greater versatility. Beginning at 170 liters per hour, the EHEIM compactON 300 is already suitable, and the EHEIM compactON 600 begins at 250 liters.